Mold for making sockets



W. M. PARKER MOLD FOR MAKING SOCKETS Filed Dec. 12, 1921 Patented Dec. 2, 1924.

UNITED STATES WILLIAM M. PARKER, OF FARKERSBURG, WEST VIRGINIA.

MOLD FOR MAKING. SOCKETS.

Application filed December 12 1921. Serial No. 521,596.

To all whom it may concern:

Be it known that 1, WILLIAM M. PARKER, a citizen of the United States, and resident of Parkersburg, in the county of WVood and State of West Virginia, have invented a new and useful Mold for Making Sockets, of which the following is a specification.

My invention relates to the type of mold for making a socket having an exteriorly threaded portion to engage a shade holder.

In the prior art such exteriorly threaded portions have been provided in various ways, such, for example, as providing a molded casing for the socket which casing holds a metal ring to engage the shade holder and my invention is especially adapted as an improvement on a mold for making sockets having such casing because I have found that the molded material sometimes clogs the thread of such metal ring and interferes to some extent with the attachment of the shade holder to such a ring.

The principal object of my invention is to overcome this defect and my invention consists primarily in providing a core for use in making the thread of an insulating casing.

In the drawing- Figure 1 is a central section of a plural socket embodying my invention, one shade holder being shown in place;

Figure 2 is an elevation on a smaller scale, showing the cores and parts of the socket assembled prior to molding;

Figure 3 is a section, partly in elevation, of a two-piece core and showing a socket shell in place;

Figure 4 is an end elevation of the parts shown in Figure 3; and

Figure 5 is an elevation, on a smaller scale and partly in section, of the parts assembled in a mold.

I illustrate my invention as embodied in a plural socket having socket shells A and A to receive lamps, for example, and having plug A to engage a fixture. Each socket and the plug are crimped to hold the porcelain pieces a, a and a each piece being provided with a rivet to act as a center contact, and each of these rivets a", a and a being provided with a central opening to receive by soldered connection the single stiff wire B which electrically connects all three centre contacts. The single stiff wire D is electrically connected internally with plug A and externally with sockets A and A.

Each wire is sufficiently stilf so that it will hold the sockets and plug in position with relation to each other for assembly prior to application of the insulating casing E which preferably consists of a shellac composition or coal tar product.

The casing E is extended outwardly beyond the open ends of shells A and A and acts as insulation between said shells and the shade holders, such as E. These extensions are exteriorly threaded, as at E the threading being integral with the casing, and of a pitch to directly cooperate with the threading of the inturned flange E of the shade holder.

In Figures 3 and 4 the shell A is in position in threaded engagement with the external threading of core member F which has an external annular shoulder F and a transverse slot F Core member F has a central hole to permit insertion of member F and also has a recess F the bottom of which forms a shoulder to engage shoulder F. The circular side wall of the recess is threaded at F but the pitch is sharper than the pitch of the thread of core member F primarily because it is desirable that there be few threads to engage the shade holder. The material E will be forced into recess F while in the mold and will. be formed with the external thread E When the described cores have been applied to shells A and A and a suitable additional core to shell A the assembled parts and cores are placed in the two-part mold G G which parts are held in place by pins 9 9, part G being broken away to show guide slot g and recess 9 which is to receive annular collar F of member F and thereby hold that member in place in the mold. The material E is molded to the inside of shell A and around the wires B and D and outside of the shells A and A and is formed with the thread E l/Vhen the molding is completed the device is removed from the mold and member 3 is unscrewed by means of the knurling F until member F is free of the material E and thereafter member F is unscrewed by means of pin F fitting in slot F said pin having also the function of preventing undesired separation of the members F and F It will be observed that the casing E is formed with an annular shoulder E for each socket to limit the movement of the shade holder.

' What I claim is:

1 A core for the purpose described comprising an interior member having a threaded portion; and an exterior member having 5 a thread of a pitch different from the pitch of the first-mentioned member, said members having capacity for relative longitudinal movement.

2. A core for the purpose described com- 10 prising an interior member having a threaded portion; and an exterior member having a thread of a pitch different from the pitch of the first-mentioned member, said members having capacity for relative longitudinal movement; and means for rotating said interior member and for lmiting said relative movement.

3. A core for the purpose described comprising an interior member having a threaded portion; and an exterior member having a thread of a pitch diflerent from the pitch of the first-mentioned member, said members having capacity for relative longitudinal movement and said exterior member having a shoulder to hold said member in place in a mold.

lVILLIAM M. PARKER. 

